如何在 Firebase 中保存位置信息

Question

我正在尝试将位置（纬度和经度）保存为 Firebase 中的 keys/fields 之一。在他们的示例 SFVehicles 中，他们确实展示了信息存储后如何查询，但我的问题是首先如何保存。

在他们的博客 post、GeoFire goes Mobile 中，他们展示了数据的外观 - 但我如何填充 location 字段？

不过我可以将其他类型的字符串保存到 Firebase。我只是使用下面的代码。问题是 location 字段应该是什么数据类型？

        Firebase ref = new Firebase("https://myfirebaselink.firebaseio.com/");

       //User 
       alan = new User("Alan Turing", 1912);


        alanRef.setValue(obj);

我尝试 location 成为 List<String>，但这没有用——位置字段如下所示：

编辑：经过更多研究，发现 this blog post by Google 但它们也保存为键 latitude1 and longitude. This probably was written before GeoFire 被引入。

Answer 1

从here看来对象的类型是 GeoLocation ，如第 83 行。

Answer 2

GeoFire for Java project has a great README, that covers (amongst other) setting location data:

In GeoFire you can set and query locations by string keys. To set a location for a key simply call the setLocation() method. The method is passed a key as a string and the location as a GeoLocation object containing the location's latitude and longitude:

geoFire.setLocation("firebase-hq", new GeoLocation(37.7853889, -122.4056973));

To check if a write was successfully saved on the server, you can add a GeoFire.CompletionListener to the setLocation() call:

geoFire.setLocation("firebase-hq", new GeoLocation(37.7853889, -122.4056973), new GeoFire.CompletionListener() {
    @Override
    public void onComplete(String key, FirebaseError error) {
        if (error != null) {
            System.err.println("There was an error saving the location to GeoFire: " + error);
        } else {
            System.out.println("Location saved on server successfully!");
        }
    }
});

To remove a location and delete it from the database simply pass the location's key to removeLocation:

geoFire.removeLocation("firebase-hq");

如何在 Firebase 中保存位置信息

how to save Location Info in Firebase

java

android

firebase

geofire